On 2014-07-24 18:14, Jim Henderson wrote:
> On Wed, 23 Jul 2014 18:33:06 +0000, Carlos E. R. wrote:
>> I can’t judge the size much, though.
>> I would have to compare with a millimeter scale 
>
> The mouse itself is described by Wacom as:
>
> Dimensions (W x D x H): 4.1” x 2.43” x 1.5” (103 x 62 x 39 mm)
LOL.
Have you seen forensic photos? Like shown on some TV serials? They put
an right angled plastic or metal strip, with black and white high
contrast markers starting a 1 cm (1 inch for you), with divisions. 
You can make one such thing with LibreOffice and a printer :-p
( → kidding)
–
Cheers / Saludos,
Carlos E. R.
(from 13.1 x86_64 “Bottle” (Minas Tirith))